Hi Subhashree
did you mark you answer as correct as that is the solution
I don't have access to provisioning side but one of the consultants mentioned some jobs run regularly for updating some of the access. I assume this is standard and not something you would need to configure (I'm not certified or an SF consultant so I don't have the provisioning access to go explore).
Since the latest patch went through I noticed some of my permission group memberships dropped off. I had to go i and edit them to resave and refresh
Today, I had a particular user have the permission group and permission role but still didn't get the access. I had to go into the permission role and edit it then save a few times until it eventually updated. I'm putting it down to a gremlin as it was a small scenario
Regards
Colleen